The StoneExtreme 7700 is based on the diesel-powered Bobcat T-300 track loader and includes three 30-inch grinding heads. Each one contains three counter rotating plates holding four diamond discs, which results in increased productivity, flatter and more consistent cuts, and a high-polishing gloss. Production reaches 8000 square feet/hour and the head attains speeds of 840 rpm. Eagle Solutions. 770-773-3875.